Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Park/Neutral Switch
The selector cam activates the park/neutral switch, which prevents the car from starting in reverse or drive and switches on the reverse lights when in reverse. The switch status is also used by the EMS 2000 in conjunction with the gear selector switch to establish the correct driving mode.
The switch is operated by a cam, which also operates the hydraulic control unit within the transmission. The selector lever via a cable to the transmission operates the cam. The switch has two positions and performs several functions, one of which is to inform the EWS immobilization unit that the transmission is in the park or neutral positions. The EWS unit will then enable the starter relay coil to be energized, thus allowing the engine to be started.
When the selector lever is in the park or neutral position and the ignition is switched on, the EMS 2000 will energize a shift lock solenoid on the selector lever. This locks the lever in the park or neutral position. The selector lever cannot be moved from the park or neutral position until the foot brake is applied.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.